Weather experts are likely to report a tornado in Deerfield Thursday.
Steve Davis, with the National Weather Service Milwaukee office said in a statement, "We are fairly confident it was a tornado. Survey by Wisconsin Emergency management and other law enforcement is delayed until Alliant Energy can secure the area. But based on radar and reported damage, it has all the signs of a tornado."
NWS may confirm the information later Thursday or on Friday.
Several people were inside International Machinery Exchange in Deerfield when severe weather rolled through, heavily damaging the building.
Paul Nehring said, "I was in the back, checking on doors, heard the garage doors slamming. I dove into a corner, the garage doors crashed in, and then I heard all sorts of commotion up front. And after that passed, I went up through the building to check on those guys. And the roof was off the building and all I could hear was gas coming through."
Alliant Energy spokesman Scott Reigstad says gas was shut off after reports of a gas odor int he area. He says International Machinery was the only customer affected.
Firefighters are still going through the area to make sure there's no more cause for concern. There were no reports of major injuries.
Although there were initial reports of a tornado, the National Weather Service has not confirmed that yet.